Malicious PDF — malware analysis report

Static analysis result for SHA-256 520beffe45409801…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 21:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3ab0928ffba8c58c450ddd477452c9c4 SHA-1: 44c35c576f79a6ccad609b8e83dd0ebd5369e569 SHA-256: 520beffe45409801290b5b6bd7448233e8da511f6c67e061484483b2fe86c4ee
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'Maplelegends corsair guide', which is likely a pretext to drive users to the malicious URL. No scripts were extracted, but the presence of malicious links is sufficient evidence for a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=maplelegends+corsair+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4462368/normal_5fca9ee1d90a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_600e686338edd.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/kigozesujubibiterojogekur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_604df24a11967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373504/normal_5feccceb233fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415068/normal_5fe55a38166f8.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/auditoria_externa_concepto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404975/normal_6004f3e534920.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/beginner_new_headway.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxepivol.myartsonline.com/fearless_outro_song_1_hour.pdfIn PDF document text
    • http://biduvilavigu.epizy.com/bulafuvovo.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/76482356107.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/cartoon_love_song_status.pdfIn PDF document text
    • http://defipezisezujor.rf.gd/dividing_fractions_worksheets_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/avanza_2017_g_manual.pdfIn PDF document text
    • http://nuvokokizuvi.epizy.com/game_maker_tutorials_for_beginners.pdfIn PDF document text
    • http://vigexop.rf.gd/related_studies_about_cosmetics.pdfIn PDF document text
    • http://dafevuzadolax.epizy.com/linubijetirasida.pdfIn PDF document text
    • http://ruguwusizomu.epizy.com/vebewotufesuxavanapazijuf.pdfIn PDF document text
    • http://bezekibep.epizy.com/how_to_uninstall_evenflo_car_seat_base.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/name_approval_guidelines.pdfIn PDF document text
    • http://puzugosinopa.epizy.com/96891627533.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/bozemuwaf.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/99315942439.pdfIn PDF document text
    • http://malejubu.myartsonline.com/86948390400.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 5248 bytes
SHA-256: 3c48e58b093809c0efb647429ab5681943c3e658031b8c0a4224520219fa93ce
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 12048 bytes
SHA-256: 9cba97c563fb76472132aa244825885fac28ac919e7edc5d99f239306f7ddde2